'Heavy' in the Bible

So the Egyptians placed supervisors over them, oppressing them with heavy burdens. The Israelis built the supply cities of Pithom and Rameses for Pharaoh.

Years later, after Moses had grown up, he went out to his own people, and took notice of their heavy burdens. He saw an Egyptian beating up a Hebrew, one of his own people.

Then Moses said to the Lord, “Please, Lord, I am not a man of words (eloquent, fluent), neither before nor since You have spoken to Your servant; for I am slow of speech and tongue.”

let the service be heavy on the men, and let them work at it, and not be dazzled by lying words.'

Then the Lord did so. And there came heavy and oppressive swarms of [bloodsucking] insects into the house of Pharaoh and his servants’ houses; in all the land of Egypt the land was corrupted and ruined because of the [great invasion of] insects.

Behold, about this time tomorrow, I will send a very heavy hail, such as has not been seen in Egypt from the day it was founded until now.

There was very heavy hail, and lightning was flashing continuously in the midst of the hail. There had not been anything like it in the land of Egypt since it had become a nation.

But Moses' hands were heavy; and they took a stone, and put it under him, and he sat thereon; and Aaron and Hur stayed up his hands, the one on the one side, and the other on the other side; and his hands were steady until the going down of the sun.

Thou wilt surely wear away, both thou, and this people that is with thee: for this thing is too heavy for thee; thou art not able to perform it thyself alone.

When morning came on the third day, there was thunder and lightning, with a heavy cloud over the mountain, and the very loud sound of a ram's horn. All the people in the camp trembled.